Appenzeller, Tim

Astronomers are more certain than ever that other planets like our own exist in the universe. Now they just have to find them.

cercetare ştiinţifică

Petit, Charles W.

More than a year after their predicted demise, NASA 's Mars rovers Spirit and Opportunity keep going and going...

Agenţia Spaţială Europeană (European Space Agency, ESA)